Improvement in window-sash springs



UNITED STATES PATENT OFFICE.,

FOSTER HEN SHAW, OF WASHINGTON, DISTRICT OF COLUMBIA.

IMPROVEMENT IN WlNDOW-SASH'SPRINGS.'

Specification forming part of Letters Patent No. 54,903, dated May 522, 1866.

' against the window-frame. Fig. 2 shows an end View of the round spring and roller; Fig. 3, a side View ot' the spring and roller. Fig. 4 shows the shape-of the roller in the center of its axis.

A represents the frame ofthe window; B, the window-sash 5 O, a lnortise and groove in the side of the sash, in which the spring rests and operates D, the spring, which is made otl steel wire otl suflicient thickness to support the weight of the sash. The lower end is bent, as seen at E, and inserted firmly in a correspondingly-shaped hole bored into the side ot' the sash. The upper end is bent to orm a slot inclineshaped, as seen at Gr, the upper end inclining slightly outward, so that the Window-sash in descending is held tighter to the frame than when being hoisted. The roller H, (pulley-shaped,) with a small center like an axle, operates in this slot Gr, the steel spring` being bent around the axle, and the axle being narrower in the center, as seen at J, than at the sides, enables the roller to roll freely in the slot without catchiu orbeing stopped by friction, and as the sash descends the roller moves to the top of the incline slot Gr and bears harder against the frame A 5 but in ascending the roller moves to the lower end of the slot, and the spring' is easier in its pressure.

I ain aware that there are tlat springs with stationary rollers attached to the sides ot' sash; but these I do not claim but What I claim as my invention, and desire to secure by Letters Patent, is-

The construction of the steel-wire spring, with itsincline slot at top,in which the grooved axle of the roller operates and is combined, as herein described, and for the purposes set forth.

FOSTE It HENSHAW'.

NVitnesses i J. FRANKLIN REIGART, J oHN S. HoLLlNesHEAD. 

